ablahadian



E. C. ABLAHADIAN.

CHEMICAL LABORATORY APPARATUS. APPLlcMloN flu-:D FEB. 16.1922.

1,435,367, I Patented Nov.14,1922.

Patented Nov. 14, i922.

niil

teaser ELEEZAG. ABLAHADIIAN, or ennnnnnn, cnLrronivI-A.

CHEMICAL Lneonaronr APPARATUS. l

f Appiica'iionlea February 16, ieee. serial No, 536,974.`

y invented certain new and useful` Improvements'in Chemical Laboratory' Apparatus,

ofj which the following is aspeciication.` v

My invention is a device, in the nature' of an improved form of filtering cylinder,

which I term The blahadian filteringV cylinder, adapted to be used in connection with the welll-.known Berks-feld lter ,com-l monly employed in most biological, bacteriological, and chemical laboratories.A

The Berkefeld filter is used to lter andfso mechanically remove bacteria and other `substances. from liquids employed inthe preparation of solutions ofy organo-therapeutic products, nucleo-proteins, etc., thus steriliz- ,ing' such liquids,

For the purpose mentioned, the Berke-y feld filter is ver necessary but, in my' en'- perience at the la nell University, New York, I encountered' certain difliculties with the vapparatus ordinarily used in connection with the Berkefel'd y 4tory substitute forr the' old form yof appafilter'.

Solutions' that do not filter spontaneously,

or do so very slowly, must be' drawnthr'ough the Berkefeld' filter by! suction.' For' this purpose, a filtering flask is employed, which is adapted to' be connected with a flexible hose leading from ya suction pump. Such a filtering-flask, as ordinarily constructed, is provided with a tight-itting, perforated rubber stopper, the lower end of the Berkefeld lter being adapted to project through the perforation in the stopper and into the filtering-flask. Inside the filtering flask, and adapted to receive the filtrate issuing from the Berkefeld filter, is placed a sterile testtube, or the like. Of course, it will be understood that the entire apparatus is sterilized to begin with, and the whole process of filtering is carried onwith rigid precautions of sterility. A flexible tubing being connected with the filtering-flask, and the suction pump connected with such tubing being started into operation, a vacuum is created inside the filtering-flask, which draws the solution in the Berkefeld filter through its core into the test-tube in the flask.

As soon as the test-tube is lled, it is necesoomis laboratory of Cor-` sary to v,stop vthe operationvof the pump, tobreak the vacuum; The rubber stopper'is then-withdrawn from the flask-to permitl removal of the test-tube, so that itmay be emptied" andv returned to the flask.y The rubber stopper.l isthen replaced, and the-op,- eration of' exhausting. the air from the flask and thus creating al vacuum is then repeated. Ally this is done withthe"` necessary precautionsk as to sterility. The procedure, necessitatedy by the construction of the filteringflask,.i`s clumsy, tiresome, and tedious, and there'is a reasonable risk' of contaminating the iiltrate'when] thetest-tube is removed .from the flask.. f

To obviate these difhculties and especially to prevent `theipiite obvious risk of contamination resulting4 from the procedure as above outlined, I. have devised a filtering` 'cylinder of novel construction, in that it is provided with 'aj `funnel attachment, 'the mouthlof' which is insidethe cylinder and.

the hollow leg orfstein projecting through` the cylinder, soth'ata test-tube maybe usedO eXteriorly, instead of interiorly, of tli'e cylinder,a's more fully appearing` hereinafter;

My invention has proved" a very satisfacratus'abovev clescribiechwith the advantages, inter alia', that the entire amount of solution to Ybe',iilteredl through,theiBerkefeld can I v. For a fuller understanding of my invention, reference may now be had tothe accompanying drawing, forming part of my specification, and in which the view is a central vertical section through a filteringcylinder constructedin accordance with my invention, and shown in operative relation with a Berkefeld filter (sh-own fragme'nta-y rily and in elevation, partly in section) and a receiving-receptacle (also shown in central vertical section). The drawing illustrates the preferred embodiment of my invention, capable of carryingoutl the underlying principles thereof. i

Referring, now, in detail, to the drawing: l designates my improved filtering-cylinder, provided with a bottom and an open ico 

